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BUG#11752315 - 43460: STOP SLAVE UNABLE TO COMPLETE WHEN SLAVE THREAD IS TRYING TO RECONNECT TO

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Problem : The basic problem is the way the thread sleeps in mysql-5.5 and also in mysql-5.1
          when we execute a stop slave on windows platform.
          On windows platform if the stop slave is executed after the master dies, we have 
          this long wait before the stop slave return a value. This is because there is a 
          sleep of the thread. The sleep is uninterruptable in the two above version,
          which was fixed by Davi patch for the BUG#11765860 for mysql-trunk. Backporting 
          his patch for mysql-5.5 fixes the problem. 

Solution : A new pair of mutex and condition variable is introduced to synchronize thread 
           sleep and finalization. A new mutex is required because the slave threads are 
           terminated while holding the slave thread locks (run_lock), which can not be 
           relinquished during termination as this would affect the lock order.

mysql-test/suite/rpl/r/rpl_start_stop_slave.result:
  The result file associated with the test added.
mysql-test/suite/rpl/t/rpl_start_stop_slave.test:
  A test to check the new functionality.
sql/rpl_mi.cc:
  The constructor using the new mutex and condition variables for the master_info.
sql/rpl_mi.h:
  The condition variable and mutex have been added for the master_info.
sql/rpl_rli.cc:
  The constructor using the new mutex and condition variables for the realy_log_info.
sql/rpl_rli.h:
  The condition variable and mutex have been added for the relay_log_info.
sql/slave.cc:
  Use a timed wait on a condition variable to implement a interruptible sleep. 
  The wait is registered with the THD object so that the thread will be woken 
  up if killed.
This commit is contained in:
Manish Kumar 2012-01-23 17:39:37 +05:30
commit e69da6dc3e
9 changed files with 112 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

4
sql/rpl_rli.cc
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@ -75,10 +75,12 @@ Relay_log_info::Relay_log_info(bool is_slave_recovery)
&data_lock, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_relay_log_info_log_space_lock,
&log_space_lock, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_relay_log_info_sleep_lock, &sleep_lock, MY_MUTEX_INIT_FAST);
mysql_cond_init(key_relay_log_info_data_cond, &data_cond, NULL);
mysql_cond_init(key_relay_log_info_start_cond, &start_cond, NULL);
mysql_cond_init(key_relay_log_info_stop_cond, &stop_cond, NULL);
mysql_cond_init(key_relay_log_info_log_space_cond, &log_space_cond, NULL);
mysql_cond_init(key_relay_log_info_sleep_cond, &sleep_cond, NULL);
relay_log.init_pthread_objects();
DBUG_VOID_RETURN;
}
@ -91,10 +93,12 @@ Relay_log_info::~Relay_log_info()
mysql_mutex_destroy(&run_lock);
mysql_mutex_destroy(&data_lock);
mysql_mutex_destroy(&log_space_lock);
mysql_mutex_destroy(&sleep_lock);
mysql_cond_destroy(&data_cond);
mysql_cond_destroy(&start_cond);
mysql_cond_destroy(&stop_cond);
mysql_cond_destroy(&log_space_cond);
mysql_cond_destroy(&sleep_cond);
relay_log.cleanup();
DBUG_VOID_RETURN;
}